sql-server-2008 - Expression Web 中的查询语句

Question

先生，Expression Web 中的以下语句适用于 count one criteria SELECT COUNT(Rly) AS CR FROM SPAD WHERE Rly='CR'。

现在的问题是，如果同一列中需要多个条件，例如Count(Rly) AS ER FROM SPAD WHERE Rly='ER'

需要什么声明？请帮忙。

Answer 1

要计算两个值：

SELECT COUNT(Rly) AS TheCount FROM SPAD WHERE Rly IN ('CR', 'ER')

一口气单独计算：

SELECT COUNT(Rly) AS TheCount, Rly 
FROM SPAD
WHERE Rly IN ('CR', 'ER')
GROUP BY Rly